Bentley made the £15million move from Blackburn to White Hart Lane two-and-a-half years ago. But he has gradually slipped down the pecking order with the form of Aaron Lennon and the arrival of Rafael van der Vaart.
Now the 26-year-old wants to show the form that led to him being hailed as the new David Beckham during the early part of his career.
Bentley said: "My relationship with Harry is fine and it is difficult when you have an abundance of talent (to pick from). I did get back in the team last year but then you have got someone like Aaron Lennon doing so well and the team is winning every week.
"It has been a difficult time, being out of the team, and there are so many great players there. But it is time to put those times aside and hopefully I can have a positive effect on Birmingham.
"This is my club for the next six months and hopefully the qualities I've got will come through. I want to resurrect my career."
Source: PA
Source: PA